------- Comment #7 from sje at cup dot hp dot com 2010-09-02 18:26 ------- I wonder if we should attack this from a different angle. We have been trying to make the .pred.mutex.rel info more accurate to avoid this warning. If we can't do that I wonder if we should make GCC more conservative about doing two predicated writes in a single instruction group. This would make the code slower but it might be an infrequent enough occurance that it doesn't matter.
Also, I currently see gfortran.dg/maxlocval_3.f90 failing with this message and when I look at the assembly code, there are two predicated writes that are using two consecutive pr registers (p12 and p13) but they are not set in a single cmp instructions. They are set seperately and I believe that both could be true which would mean that we are generating invalid code. I am going to test a patch that changes rws_access_regno to not allow two predicated register write in the same instruction group. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43760
